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Finding the Fourth Proportional to 21,223.68, 29,286.72 and 11,791.68

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Solution

The fourth proportional to 21,223.68, 29,286.72 and 11,791.68 is: 16,271.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,223.68 : 29,286.72 = 11,791.68 : x
  2. Step 2: Convert to fraction form
    21,223.68/29,286.72 = 11,791.68/x
  3. Step 3: Cross multiply
    21,223.68x = 29,286.72 × 11,791.68
  4. Step 4: Simplify right side
    21,223.68x = 345,339,630.49
  5. Step 5: Solve for x
    x = 345,339,630.49/21,223.68
  6. Step 6: Final answer
    x = 16,271.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.